Improvement in steam-boilers



- boilers in general use.

UNITED ASTATES PATENT OEEICE.

JOSEPH H. SPRINGER, OF PHILADELPHIA, PENNSYL HIMSELF AND MILTON FOREMAN, OF SAME PLAGE.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 41,665, dated February 16, 1864.

marked thereon.

My invention consists of any desired number of tubes, each of which has an internal or air tube and a series ot' openings, the said tubes being bent and arranged in the boiler as described hereinafter, so as to insure the ignition ofthe unconsumed products of com bustion without injury to the tubes.

In order to enable others skilled'in the art to make and apply my invention, I will now proceed to describe its construction and operation. y

O11 reference to the accompanying' draw,- ings, which form a part ot' this specilication, Figure l is a vertical section ot'sufticient ot' a locomotive-boiler to illustrate my invention Fig. 2, a transverse vertical section on the line 1 2, Fig. 1, and Fig. 3 an enlarged sectional view of one the air-tubes.

Similar letters ret'er to similar parts throughout the several views.

Arepresents the tire-box of a locomotiveboiler; B, the combustion-chamber; a, the front tube-plate, and G part ot' the body of the boiler, all of which parts are similar in construction to those of locomotive In the combustion` chamber I arrange the two air-tubes D and D', which are bent to the form, or nearly to the form, best observed on reference to Fig 2, the upper end of the tube D being secured to the side d of the combustion-chamber, near the upper corner of the same, and the lower end ot' t-lie tube to the side df, near the lower corner of the said chamber. The tube Dl is arranged in the reverse position, its upper end being secured to the side d and lower end to the side d ot' the combustion-chamber. Vithin each tube is another tube, E, bent to the same form as the outer tube, and between the two tubes is an annular space, f, best observed on reference to Fig. 3.

Both of the tubes D and Dl are so secured to the sides ofthe combustion-chamber that the space between the inner and outer tubes shall communicate both above l and below with the water-spaces between the combustion-chamber and the outer shell ofthe boiler, as seen in Fig. 2. Each inner tnbe is closed at the upper end, the lower end passing through the water-space-one tube on one side and the other tube on the other side of the boilerand both tubes communicating with the external atmosphere.

In each ofthe tubes D and D', and at suitable intervals, are openings i, (see Fig. 3,) forming communications between the interior of the inner tubes, E, and combustionchamber. y

It will be observed on reference to Fig. l that the two tubes D and D are arranged enea littlein advance ofthe other. As many additional tubes as desired, arrangedin a similar manner inl respect to each other and to the combustion-chamber,may, however, be introducedinto the latter.

As the products ot combustion pass from the lirebox into the combustiOnchamber, they are met b v jets of air passing through the openings i of the tubes D and D', by which jets the unconsumed gases are ignited and pass oft'in the form ot' iiames from the combustion-chamber into the usual tubes. A free and uninterrupted circulation of water is maintained through the space between the inner and outer tubes; hence the inner tube or air-tube is not only etliciently pro tected against the action ot' the fire, but the air is heated prior to passing oft' in jets through the openings 1'.

It is important that the tubes should be bent to the form shown in the drawings, or to some other form that will permit'the said tubes to yield to a limited extent and accommodate themselves to any unequal expansion and contraction which may take place.

I claim as my invention and desire to secure by Letters Patentrlhe tubes D, internal tubes, E, and airopenings z', when the said tubes are formed and arranged within the boiler as and for the purpose described. l

In testimony whereofI have signed my name to this specitcation in the presence ottwo subscribing witnesses.

JOSEPH II. SPRINGER.

Witnesses:

HENRY HowsoN, CHARLES HowsoN.

VANIA, ASSIGNOR TO 

